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Business combinations and disposal Business combinations and disposals - Ascend Management Innovations, LLC (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Feb. 29, 2016 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
Business combinations |  |  |  |
Gain on sale of a business |  | $ 6,880 | $ 0 | $ 0
Goodwill |  | $ 21,453 |  |
Ascend Management Innovations LLC |  |  |  |
Business combinations |  |  |  |
Share capital acquired (as a percent) | 100.00% |  |  |
Purchase consideration, net of cash acquired | $ 44,069 |  |  |
Intangible assets | $ 22,300 |  |  |
Amortization period of intangible assets | 18 years |  |  |
Goodwill | $ 18,554 |  |  |

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